The Centers for Disease Control and Prevention also said men and women who recently visited Miami should wait at least eight weeks before trying to conceive a child

Robert Muxo, a Miami-Dade County mosquito control inspector, inspects a property for mosquitos or breeding areas in the Wynwood neighborhood as the county fights to control the Zika virus outbreak on July 30, 2016 in Miami, Florida.

MIAMI — Government health officials are warning that pregnant women should avoid travel to a Zika-stricken part of Miami and urging expectant mothers who frequent the neighbourhood to get tested for the virus, after the number of people feared infected through mosquito bites in the U.S. climbed to 14.

In a warning issued Monday, the Centers for Disease Control and Prevention also said men and women who have recently visited the area should wait at least eight weeks before trying to conceive a child.

Gov. Rick Scott asked Monday for a federal emergency response team to help the state combat the spread of the virus in the U.S.

AP Photo/Rick Bowmer

Officials announced four cases on Friday, believed to be first people to contract the virus from mosquitoes within the 50 states. Ten more cases were announced Monday. The CDC’s emergency response team will help Florida officials in their investigation, sample collection and mosquito control efforts. The White House said the CDC team would be deployed to Florida “in short order.”

Zika is such a mild disease that most who get it don’t even know they’ve been infected, but it can lead to severe brain-related birth defects if women are infected during pregnancy. The disease has swept through Latin America and the Caribbean in recent months.

Florida health officials said they’ve tested more than 200 people in Miami-Dade and Broward Counties after reports of local transmissions of the virus in early July. Of the 14 people infected, two are women and 12 are men.

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“We will continue to keep our residents and visitors safe utilizing constant surveillance and aggressive strategies, such as increased mosquito spraying, that have allowed our state to fight similar viruses,” Scott said in a statement.

The Florida infections are thought to have occurred in a small area just north of downtown Miami, in the Wynwood arts district. The travel warning covers an area of about one square mile in Wynwood to the east of Interstate 95 and south of Interstate 195.

U.S. health officials do not expect widespread outbreaks of the sort seen in Brazil and in Latin America and the Caribbean, in part because of better sanitation, better mosquito control and wider use of window screens and air conditioners.

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The area, known for murals spray-painted across warehouses, art galleries, restaurants and boutiques, is rapidly gentrifying and has a number of construction sites where standing water can collect and serve as a breeding ground for mosquitoes.

Many walking the streets recently were unaware the virus had spread and confused about how the disease is transmitted.

Jordan Davison and Melissa Felix work for a cruise line and were enjoying their day off Monday looking at the murals in the neighbourhood.

“It’s not like a big thing right?” said 25-year-old Davidson. “It’s kind of freaky — there’s so much going on we didn’t know, didn’t really think about it … I might wear bug spray going forward.”